Dump1030 is C++ program capable of detecting different types of SSR interrogations. Seven types of messages can be detected: Mode S, Mode A, Mode A all-call, Mode A all-call (Compatibility mode), Mode C, Mode C all-call and Mode C all-call (Compatibility mode).
Dump1030 is based on the popular dump1090, especially antirez's implementation (https://github.com/antirez/dump1090).
Clone and compile with make.
Linux computer with RTL-SDR radio capable of receiving 2.5 MSPS at 1030 mhz stable.
The binary can be ran with default settings.
Command line arguments:
--device Input rtl-sdr device index
--file Input location and full name of test file that is used instead of rtl-sdr device
--gain Input desired gain level for rtl-sdr device
--agc Enable automatic gain control by RTL-SDR device
--diff Add minimum amplitude difference between pulses and non pulses that are not right next to pulse values
--diffclose Add minimum amplitude difference between pulses and non pulses right next to pulses
--diffratio Add minimum ratio of non pulse amplitude divided by pulse amplitude for every non pulse value not right next to pulse value (Doesn't apply to checking p4 pulse existence)
--diffratioclose Add minimum ratio of non pulse amplitude divided by pulse amplitude for every non pulse value right next to pulse
--diffratiop4 Same as diffratio but only for p4 check (Mode a/c only all-call and Mode a/c/s all-call (Compatibility mode) messages)
Compares only p4 pulse values with non pulse values that are after p3 but not next to pulse values.
--diffratioclosep4 Same as diffratio but only for p4 check (Mode a/c only all-call and Mode a/c/s all-call (Compatibility mode) messages)
Compares only p4 pulse values with non pulse values that are after p3 and next to pulse values.
--msgs Show every recognized messages location and amplitude values in the message
--order Print order of different SSR interrogation signals
--mpa Minimum accepted pulse amplitude when there should be a pulse
--mnf Maximum allowed noicefloor amplitude when there shouldn't be a pulse
--mnfc Maximum allowed noicefloor amplitude for non pulse values next to pulse values.
--size Defines size of read message in bytes when using rtl-sdr. Must be at least 512 otherwise uses default size of 262144.
--blmode Outputs baseline values for mpa, mnf and mnfc based on accepted averages. Can be used to get baseline values based on earlier detected messages averages that can be set for detecting next messages.
--print Print all captured amplitude data.
--continuous Keeps detecting and reporting messages continuously. Size parameter sets update interval.
--help Show helpAll arguments might not be compatible with each other.